1278374411 has 2 divisors, whose sum is σ = 1278374412. Its totient is φ = 1278374410.

The previous prime is 1278374393. The next prime is 1278374413. The reversal of 1278374411 is 1144738721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278374411 - 2²⁶ = 1211265547 is a prime.

It is a super-2 number, since 2×1278374411² = 3268482269399193842, which contains 22 as substring.

Together with 1278374413, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1278374413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639187205 + 639187206.

It is an arithmetic number, because the mean of its divisors is an integer number (639187206).

Almost surely, 2^1278374411 is an apocalyptic number.

1278374411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278374411 is an equidigital number, since it uses as much as digits as its factorization.

1278374411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 1278374411 is about 35754.3621254806. The cubic root of 1278374411 is about 1085.3072136489.

The spelling of 1278374411 in words is "one billion, two hundred seventy-eight million, three hundred seventy-four thousand, four hundred eleven".